The worst typo I ever made in a book for publication: "A warning light alters the operator when the paper supply is low."

Links
History of Writing Parker Pen Co.
Online Resources for Writers University of Maine
Writer's Digest "online guide to getting published"

Writing English
The Slot A Spot for Copy Editors. Includes The Curmudgeon's Stylebook
The Elements of Style Strunk & White
Resources for Writers
Common Errors in English

Plain-English Movement
Plain Language Action Network
The Word Centre Sheffield, UK
How you can make plain English work for you
Garbl's Plain Language Resources
Plain Language Resources

Technical Writing
STC Society for Technical Communication
STC Silicon Valley Chapter meetings, job listings, etc.
Tech Writing About.com
Doug Hall's Page

Satire
Bulwer-Lytton Fiction Contest Where "WWW" means Wretched Writers Welcome